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Water electrolysis system and method of stopping operation thereof

a water electrolysis system and water electrolysis technology, applied in the field can solve problems such as complex configuration of water electrolysis system, and achieve the effect of simple configuration

Active Publication Date: 2020-09-08
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a water electrolysis system that prevents liquid water from freezing in a gas-liquid separator when the water electrolysis device is stopped. This is achieved by using a simple configuration where liquid water inside the gas-liquid separator can be drained into the drainage passage when the water electrolysis device is stopped. The system also includes a method for stopping operation. The technical effect is to prevent damage to the system and leakage of hydrogen to the exterior when the water electrolysis device is stopped.

Problems solved by technology

However, if such a heater is used, there is a problem in that the configuration of the water electrolysis system becomes complicated.

Method used

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  • Water electrolysis system and method of stopping operation thereof
  • Water electrolysis system and method of stopping operation thereof
  • Water electrolysis system and method of stopping operation thereof

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Embodiment Construction

[0037]Preferred embodiments of a water electrolysis system and a method of stopping operation thereof according to the present invention will be presented and described below with reference to the accompanying drawings.

[0038]As shown in FIG. 1, the water electrolysis system 10 according to an embodiment of the present invention is configured as a differential pressure type high pressure water electrolysis system, and is equipped with a water electrolysis device 12, a water supplying system 14, a hydrogen supplying system 16, a water drainage system 18, a pressure release system 20, and a control unit 22.

[0039]The water electrolysis device 12 is a differential pressure type high pressure water electrolysis device which generates oxygen and high pressure hydrogen by performing electrolysis on supplied water (pure water). The high pressure hydrogen has a pressure higher than atmospheric pressure. More specifically, the term “high pressure hydrogen” refers to hydrogen gas having a high ...

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Abstract

A water electrolysis system is equipped with a water electrolysis device, a water supply passage, a hydrogen supply passage, a gas-liquid separator, a first water drainage passage, a first water drainage valve, a second water drainage valve, a determination unit, and a valve control unit. In a method of stopping operation of the water electrolysis system, in a water drainage step, in the case that the determination unit determines that operation of the water electrolysis device has been stopped, the first water drainage valve is controlled to be placed in a valve open state, thereby draining liquid water from the gas-liquid separator into the first water drainage passage.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2017-139861 filed on Jul. 19, 2017, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to a water electrolysis system for generating oxygen and hydrogen by performing electrolysis on supplied water, as well as a method for stopping operation of such a water electrolysis system.Description of the Related Art[0003]In general, hydrogen is used as a fuel gas that is used in a power generating reaction of a fuel cell. Such hydrogen is produced, for example, by the water electrolysis system disclosed in Japanese Laid-Open Patent Publication No. 2012-067343. Such a water electrolysis system is equipped with a water electrolysis device that generates oxygen and hydrogen gas by performing electrolysis on water (pure water).[0004]The hydrogen gas produced b...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C25B15/02C25B1/04C25B1/12C25B9/06C25B9/17
CPCC25B1/04C25B9/06C25B15/02C25B1/12Y02E60/36C25B9/17C25B9/05
Inventor TAKEUCHI, JUNKURASHINA, DAISUKEFUKUSHIMA, YUKIHIRO
Owner HONDA MOTOR CO LTD
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